Mineral (Variety Of Quartz)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Chert (Common Opal/Jasper variety)

Microcrystalline Quartz (SiO2) with hydration

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Epidote in Quartz

Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Rutilated Quartz

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Chert (Tan/Brown variety)

Chert (Silicon Dioxide, SiO2)

Chert (Tan/Grey variety)

Silicon Dioxide (SiO2)

Iron-Stained Quartz (Riverside Cobble)

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Quartz with Iron Oxide Inclusions

SiO2 with Fe2O3 impurities

Aventurine (Green)

Silicon Dioxide (Quartz variety) containing Fuchsite - SiO2 + K(Al,Cr)2AlSi3O10(OH)2

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Banded Agate

Silicon Dioxide (SiO2)

Orca Agate

Chalcedony (SiO2) with various inclusions

Agate (or Chalcedony)

Silicon Dioxide (SiO2)

Blue Lace Agate

Chalcedony (Silicon Dioxide, SiO2)

Blue Lace Agate

Chalcedony (SiO2)

Chert / Jasper / Agate (Chalcedony Group)

Microcrystalline Quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (Metamorphic rock)

Granitic Gneiss

Gneiss (Metamorphic rock of granitic composition)

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Shale

Shale (clastic sedimentary rock)

Pyrite

Iron Disulfide (FeS2)

Green Chert (Jasper)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Quartz (Silicon Dioxide - SiO2)

Clear Quartz Sphere

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz Pebble (Tumbled Quartzite)

Silicon Dioxide (SiO2)

Milky Quartz Geode or Druzy Quartz

Silicon Dioxide (SiO2)

Quartz (Crystal Cluster)

Silicon Dioxide (SiO2)

Quartz (Iron-stained or Ferruginous)

Silicon Dioxide (SiO2)

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)